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Intangible Assets and Goodwill (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Intangible Assets and Goodwill (Textual) [Abstract]      
Carrying amount of goodwill $ 35,631,000 $ 35,631,000  
Intangible assets and goodwill (Additional Textual) [Abstract]      
Weighted-average amortization period of intangible assets consisted of time-charter contracts 19.2 19.2  
Amortization of Intangible Assets 9,100,000 9,100,000 9,100,000
Amortization expense of intangible assets, 2012 9,100,000    
Amortization expense of intangible assets, 2013 9,100,000    
Amortization expense of intangible assets, 2014 9,100,000    
Amortization expense of intangible assets, 2015 9,100,000    
Amortization expense of intangible assets, 2016 9,100,000    
Liquefied Gas Segment [Member]
      
Intangible Assets and Goodwill (Textual) [Abstract]      
Carrying amount of goodwill 35,631,000 35,631,000  
Conventional Tanker Segment [Member]
      
Intangible Assets and Goodwill (Textual) [Abstract]      
Goodwill impairment loss $ 0 $ 0 $ 0